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Most helicopter rotors are constant angle. Propeller pitch is usually increasing toward the tip.

My experience with crush pins has been dismal! Go with a proper snap every time.

Thanks for the source. Problem is Their minimums and handling fess are GROSS. I need sixteen inches of this stuff. I can't spend seventy plus dollars plus shipping...

Where can I buy a small quantity of one inch HIPS tube?

Many errors here: 1. Heavy section at base of stud and around hole. Revise to constant wall. 2. .004 interferance out of .09375 is too much. 3. 3 degrees is way too much. Consider 1/2 degree. 4.Fits like this will invariably fail over time due to relaxation. Use solvent bonding instead.

Become a toy designer. I did and found it quite rewarding!

Check which brass is being used. Some are rather brittle.

Try ethylene dichloride. This is a solvent, not a stickum. All residue evaporates. It is widely used for cementing acrylics.

Everybody has missed a point: A helicoid is not developable! A closely related surface appropriately called a "developable helicoid" exists. The straight line elements are not radial as in the helicoid, but are tangent to the inner cylinder. A real excercise in descriptive geometry. I think...

I'm gonna write it before anyone else has a chance: Don't reinvent the wheel! There has to be wheels available at low cost, so you need not go through design, mold build, first shots, mold revision etc.....

Adding to what Greg locock wrote, one reason design for under water is less finicky than design for air is that water is far denser than air, making Reynolds numbers lots bigger.

And TEST what you write before turning ir loose!

The fixture is simple. I spent $2.31 for some wood and used an electric stapler that was on hand. I hacked it on my kitchen table. Took most of a day. Works a dream!

Its me again. I experienced an epiphany and all the complications vanished, leaving a simple manual fixture. WHEE!

Thanks again. This is close to what I am designing.

Gentlemen: Thanks for your replies. But I should have written that the point of this exercise is not to save labor. It is to: ASSURE QUALITY. I want to have all the headers going on straight, no twisted bags, etc. Does this thought change your answers?

I must find/devise equipment to facilitate putting an object into a plastic bag, add a card header to the bag and neatly staple it. The object is 1" X 2.75" X 9.75", fairly hard rubber. Weighs .3 lb. Bag is .002 polyethylene, 3' wide, 13" tall. The header is .010 card, 3.5 x 4 folded to 3.5 x 2...

Maste Master? I am here. I outlived all the others. r

The specific speed is wrong for a centfugal. Available power is many times what is needed. A tiny piston pump with a leather or O-ring piston seal should work. Simple and effective!

The type of pump to use depends heavily on the head that needs to be developed, the flow, and the rpm. In short: Specific Speed. Head and flow depend on what you need, rpm can be adjusted by gear or belt drives. The irregular effort you mention can be smoothed by using a flywheel. My guess is...